Remove --os-url usage
Remove --os-url usage

The token end-point --os-url argument was removed in openstackclient
with I1b9fbb96e447889a41b705324725a2ffc8ecfd9f.

The plugin should be running as admin, I think we can remove all the
authentication arguments and just let it do it's thing.

Change-Id: I9b1dbc541c9fd6c0e3a894dd3a5dd9f2011f1e2a

openstack/magnum,openstack/magnum,ArchiFleKs/magnum,ArchiFleKs/magnum